Multi-Smart-Gateway mode: a new feature which - together with BRDP (Border Router Discovery Protocol) - allows seamless connectivity without breaking connections (the well known NAT-switching problem). There is more information about BRDP and Multi-Smart-Gateway mode in Ferry's presentation from the last battlemesh

Fix invalid output from the json plugin

(and again) Many small fixes all over the tree, with one (for the hashing script) that's particularly important to people building olsrd from source.